An execution method comprises the following operations: —every time an instruction to be protected of a preceding basic block is loaded, constructing a new value of a signature of this preceding basic block from the value of this instruction to be protected and the preceding value of the signature. The method further includes loading an initialization vector contained in a subsequent basic block and calculating, from said loaded initialization vector, a value reached for signing the preceding basic block. The method also includes comparing the constructed value of the signature with the expected value of this signature, and—only if these values do not match, triggering the signaling of a fault during the execution of the machine code.
Legal claims defining the scope of protection, as filed with the USPTO.
5. The method as claimed in claim 1, wherein, in 2), the preprogrammed function Fcs( ) is an encryption function using a secret key stored in a secure memory of the microprocessor, the secure memory being only accessible by internal components of the microprocessor.
6. The method as claimed in claim 1, wherein, in 2), the preprogrammed function Fcs( ) is an algebraic homomorphism.
8. The method as claimed in claim 1, wherein the preprogrammed function Fvs( ) is an identity function.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
September 14, 2018
September 13, 2022
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